Revision as of 01:42, 24 July 2007

Contents

Variometer

The variometer signal is simply the derivative of the barometer signal. It gives a much more accurate vertical speed signal than is possible with GPS. It would probably be best to filter and differentiate the analog pressure signal and then digitize. This kind of measurement is used by the flee flying community (hanggliding, paragliding, ballooning). A device that allows teams of pilots to share position and speed (with accurate vertical speed) data would be lots of fun.
Variometer Reference

These values are provided to listeners in multiple applications.
The sample rate should be application adjustable to conserve power.

Application code

Applications can use the altitude data or combine the data with GPS and accelerometer data.
Commonly Kalman filter/observer techniques are used to combine data from multiple sensor types into a robust(with respect to sensor noise), high accuracy estimate of position and speed in 3 axis.

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Variometer

The variometer signal is simply the derivative of the barometer signal. It gives a much more accurate vertical speed signal than is possible with GPS. It would probably be best to filter and differentiate the analog pressure signal and then digitize. This kind of measurement is used by the flee flying community (hanggliding, paragliding, ballooning). A device that allows teams of pilots to share position and speed (with accurate vertical speed) data would be lots of fun.
Variometer Reference

These values are provided to listeners in multiple applications.
The sample rate should be application adjustable to conserve power.

Application code

Applications can use the altitude data or combine the data with GPS and accelerometer data.
Commonly Kalman filter/observer techniques are used to combine data from multiple sensor types into a robust(with respect to sensor noise), high accuracy estimate of position and speed in 3 axis.